<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div id="app">
        总价:{{ prices }}
    </div>
    <script src="https://unpkg.com/vue/dist/vue.min.js"></script>
    <script>
        var app = new Vue({
            el:'#app',
            data: {
                package1: [
                    {
                        name:'iphone7',
                        price:7199,
                        count:2
                    },
                    {
                        name:'ipad',
                        price:2888,
                        count:1
                    }
                ],
                package2: [
                    {
                        name:'apple',
                        price:3,
                        count:5
                    },
                    {
                        name:'banana',
                        price:2,
                        count:10
                    }
                ]
            },
            computed:{
                prices:function() {
                    var prices = 0;
                    for (var i = 0; i < this.package1.length; i++){
                        prices += this.package1[i].price * this.package1[i].count;
                    }
                    for (var i = 0; i < this.package2.length; i++){
                        prices += this.package2[i].price * this.package2[i].count;
                    }
                    return prices;
                }
            }
        })
    </script>
</body>
</html>